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a-base is a library of basic (hence the name) classes, most notably immutable collection classes with copy-on-write operations

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package com.ajjpj.abase.collection.immutable;

/**
 * @author arno
 */
class AMapWithDefaultValue extends AWrappedMap {
    private final V defaultValue;

    AMapWithDefaultValue(AMap inner, V defaultValue) {
        super(inner);
        this.defaultValue = defaultValue;
    }

    @Override AMap wrap(AMap inner) {
        return new AMapWithDefaultValue<>(inner, defaultValue);
    }

    @Override V defaultValue(K key) {
        return defaultValue;
    }
}